Couch arm



FIG. 1 is a front, top and left side perspective view of a couch arm showing my new design;

FIG. 2 is a front, top and right side perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a right side elevational view thereof.

The bottom plan view is not illustrated as it forms no part of the claimed design. The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a couch arm, as shown and described. 